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    <p>I'd like to propose you a recursive solution, which make use of <code>Node#replaceChild</code> method to replace a node with a new tag:</p> <pre><code>public static void paintAllNodes(Node node) { if (node.getNodeType() == Node.ELEMENT_NODE) { Element somethingElement = node.getOwnerDocument().createElement("something"); somethingElement.setAttribute("style", "background-color:red"); node.getParentNode().replaceChild(somethingElement, node); somethingElement.appendChild(node); NodeList nodeList = node.getChildNodes(); for (int i = 0; i &lt; nodeList.getLength(); i++) { paintAllNodes(nodeList.item(i)); } } } </code></pre> <p>This is my main:</p> <pre><code>public static void main(String[] args) throws SAXException, IOException, ParserConfigurationException, TransformerException { DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder(); Document document = docBuilder.parse(new File("document.xml")); paintAllNodes(document.getDocumentElement()); TransformerFactory transformerFactory = TransformerFactory.newInstance(); Transformer transformer = transformerFactory.newTransformer(); DOMSource source = new DOMSource(document); StreamResult result = new StreamResult(System.out); transformer.transform(source, result); } </code></pre> <p>I've tested it with this xml:</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;title&gt;title&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;h1&gt;title&lt;/h1&gt; &lt;div&gt;test&lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>My main has printed out this new xml, which seems to be what you want:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;&lt;something style="background-color:red"&gt;&lt;html&gt; &lt;something style="background-color:red"&gt;&lt;head&gt; &lt;something style="background-color:red"&gt;&lt;title&gt;title&lt;/title&gt;&lt;/something&gt; &lt;/head&gt;&lt;/something&gt; &lt;something style="background-color:red"&gt;&lt;body&gt; &lt;something style="background-color:red"&gt;&lt;h1&gt;title&lt;/h1&gt;&lt;/something&gt; &lt;something style="background-color:red"&gt;&lt;div&gt;test&lt;/div&gt;&lt;/something&gt; &lt;/body&gt;&lt;/something&gt; &lt;/html&gt;&lt;/something&gt; </code></pre> <p>Hope this helps.</p>
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    1. POJava: how to wrap all elements with <sometag> in org.w3c.dom?
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    1. POJava: how to wrap all elements with <sometag> in org.w3c.dom?
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    1. COI get nullexception at ` Element somethingElement = node.getOwnerDocument().createElement("something");`
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    2. COHave you used my main method? At the first time you have to pass to `paintAllNodes` the `document.getDocumentElement()`: `paintAllNodes(document.getDocumentElement());`. Have you done that?
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    3. COyes but it's not working still.
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